Bobbin head ring



Sept. 18, 1923. I 1,41%,427

J. O. WALLGREN BOBBIN HEAD RING Filed March 15. 1922 [ark/150x" M WELLGRL'N fij fldfomep Patented Sept. 18, 1923.

JOHN O. WALLGREN, OF WORCESTER, MASSACHUSETTS.

BOBBIN HEAD nine.

Application filed Harch 15, 1922.

To all whom it may concern:

Be it known that I, JOHN O. WALLGREN, citizen of the United Statea'residing at Worcester, in the county of Worcester, and

State of Massachusetts, have invented a new. and useful. Bobbin Head Ring of which the following is a specification.

V This invention relates to wire rings for the heads of weft bob-bins such as areused in large numbers in connectlon with auto-.

matic weft replenishing looms. The head of each such bobbin is provided with two or three wire rings by which the bobbin is firmly held in the shuttle by special bobbin springs providedfor the purpose.

It is the object of my invention toprovide an improved construction of bobbin ring, in the manufacture ofwhich wire of non-circular cross section is employed with iinpoflant advantages resultant therefrom.

The improved method of manufacture which I describe is not claimed herein, as it forms the subject matter of a copending divisional application, Serial No. 658,797, filed Aug. 22, 1923.

Further details of my invention are disclosed in the drawings in which F'g. I indicates the first step in the production of my improved ring;

Fig. 2 is a sectional view taken along the line 2-2 in Fig 1;

Fig. '3 is a plan view illustrating the second step in forming my improved ring;

Fig. 4- is a sectional elevation taken along the line 4-4 in Fig. 3;.

Fig. 5 is aside viewv of a bobbin head 7 provided with my improved rings; and

Fig. 6 is a sectional view of the bobin head shown in Fig. 5.

Referring to the drawings, I haveshown in Figs. 5 and 6, a bobbin head 10 of a usual form, provided with three. bobbin rings 11. This particular bobbin is also provided with a metal casing 12 prOtecting the end of the head 10, but this forms no part of my invention.

It has been customary heretofore to form J the bobbin rings from wire having a circular cross section, but my improved rings'are formed of wire preferably having the sec- Serial no. 543,953.

t-ional out-line shown in Fig. 2, with a substanti ally fiat face 13, with sides 14; slightly inclined toward each other, and with a substantially semi-circular outer face 15, the edges 13' being slightly rounded as shown in Fig. 2.

. In forming my improved ring, I first provide the rounded face of the wire with pairs of adjacent nicks or V-shaped openings 16, as clearly shown in Fig. 1, the distance between adjacent pairs of nicks or openings corresponding to the desired circumference of the finished ring. The nicks 16 are commonly formed in a press which provides accurate spacing of the adjacent nicks of each pair.

The stock is then subjected to the press operation indicated inFigs. 3 and 4, in which a punch 17 having concave side edges forces the portion of stock 18 between the nicks 16 downward through a die-block 19. This leaves the pieces of stock with cleanly beveled and rounded ends as indicated particularly in Figs. 4: and 5.

The stock is then bent to the desired circular form and i hardened and tempered or otherwise treated to produce a finished ring.

The rings thus formed are seated in grooves 20 in the bobbin heads, these grooves having flat bottoms and substantially straight side walls as indicated in Fig.6.

My improved rings are seated much more firmly in the grooves than is possible with rings of circular cross section and they also engage the straight side walls of the grooves in such a. way that the probability of accidental displacement is greatly reduced. Furthermore, the use of stock having a flat side for the inside of the rings enables me to easily produce satisfactory beveled ends for each ring. the beveled surface extending within. the grooves 20 so that it is practically impossible for the thread on an adjacent bobbin to be caught by the ends of the rings. This catching of the threads has been a somewhat frequent and objectionable experience with rings heretofore in use.

Having thus described my invention and the advantages thereof, I do not wish to be limited to the details herein disclosed otherwise than as set forth in the claims, but What ll claim is 1. A bobbin head ring having a sub 5 stantially fiat inner surface and a substantially semi-circular outer surface.

2. A bobbin head ring formed of Wire having a substantially flat surface disposed at the inside of the ring, the two side faces of the ring'slightly approaching outwardly, and said ring having a substantially semicircular outer face.

In testimonywvhereof I have hereunto affixed my signature.

JOHN 0. WALLGREN, 

